Genetic variation in the decay resistance of Scots pine wood against brown rot fungus

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Abstract:

The role of genotype in the durability of Scots pine (Pinus sylvestris L.) wood against decay by brown rot fungus (Coniophora puteana (Schum. ex Fr.) Karst. (strain Bam EBW 15)) was studied in a laboratory test. The wood material was obtained from 32-year-old half-sib progenies of Scots pine. The increment core samples of sapwood and juvenile heartwood were decayed using a modification of the standardized EN 113 method. The mean densities of the sapwood and heartwood samples were 391 and 337 mg·cm–3, respectively, and the mean mass losses were 114 and 80 mg·cm–3, respectively. The additive genetic components were small compared with the total phenotypic variance, which resulted in small narrow-sense heritabilities in mass loss. The most marked feature was the wide phenotypic variation in mass loss observed in heartwood (range 199 mg·cm–3) compared with sapwood (range 72 mg·cm–3) samples. Low heritability, together with the relatively high coefficient of additive genetic variation (CVA) in heartwood mass loss, suggests that advances in breeding can only be made through intensive testing in the environments which the studied experiment represents.

Le rôle du génotype dans la résistance du bois du pin sylvestre (Pinus sylvestris L.) à la carie causée par le champignon de carie brune (Coniophora puteana (Schum. ex Fr.) Karst. (race Bam EBW 15)) a été étudié en laboratoire. Le matériel ligneux provenait de descendants uniparentaux de pin sylvestre âgés de 32 ans. Des carottes de bois d'aubier et de bois de cœur juvénile ont été soumises à un test de décomposition en utilisant une modification de la méthode standard EN 113. La densité moyenne des échantillons de bois d'aubier et de bois de cœur était respectivement de 391 et 337 mg·cm–3. En moyenne, la perte de poids des échantillons de bois d'aubier était de 114 mg·cm–3 et celle des échantillons de bois de cœur de 80 mg·cm–3. Les composantes génétiques additives étaient faibles comparativement à la variance phénotypique totale, ce qui correspond à de faibles héritabilités au sens strict pour la perte de poids. La caractéristique la plus marquante est la grande variation phénotypique dans la perte de poids observée dans les échantillons de bois de cœur (écart de 199 mg·cm–3) comparativement aux échantillons de bois d'aubier (écart de 72 mg·cm–3). La faible héritabilité, accompagnée d'un coefficient de variation génétique additive (CVA) relativement élevé pour la perte de poids du bois de cœur, indiquent que seuls des tests intensifs dans les milieux représentatifs de l'étude permettraient d'obtenir des résultats significatifs grâce à l'amélioration génétique.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 1, 2001

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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